sysdeps/unix/sysv/linux/settimeofday.c

   1 /* settimeofday -- set system time - Linux version supporting 64 bit time.
   2    Copyright (C) 2020-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <time.h>
  21 #include <sys/time.h>
  22
  23 /* Set the current time of day and timezone information.
  24    This call is restricted to the super-user.  */
  25 int
  26 __settimeofday64 (const struct __timeval64 *tv, const struct timezone *tz)
  27 {
  28   /* Backwards compatibility for setting the UTC offset.  */
  29   if (__glibc_unlikely (tz != 0))
  30     {
  31       if (tv != 0)
  32         {
  33           __set_errno (EINVAL);
  34           return -1;
  35         }
  36       return __settimezone (tz);
  37     }
  38
  39   struct __timespec64 ts = timeval64_to_timespec64 (*tv);
  40   return __clock_settime64 (CLOCK_REALTIME, &ts);
  41 }
  42
  43 #if __TIMESIZE != 64
  44 libc_hidden_def (__settimeofday64)
  45
  46 int
  47 __settimeofday (const struct timeval *tv, const struct timezone *tz)
  48 {
  49   if (__glibc_unlikely (tv == NULL))
  50     return __settimeofday64 (NULL, tz);
  51   else
  52     {
  53       struct __timeval64 tv64 = valid_timeval_to_timeval64 (*tv);
  54       return __settimeofday64 (&tv64, tz);
  55     }
  56 }
  57 #endif
  58 weak_alias (__settimeofday, settimeofday);